If you go to Navsource, USS Argonne AG, photo number 19-N-302304, there is a much better picture of the structure.Dave Alcott is very likely correct.

Regards, rjccjr

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Trying to figure out what the heck this structure is on the stern of USS Argonne 1941. Initially I thought it was a large crane base similar to the ones on Sea Plane Tenders of the time but that doesn't make sense to have one on her. Plus, the structure itself is boxed shape not rounded like the crane bases were. Any ideas?